| Precision pneumatic regulators are widely used, such as in pantograph systems of high speed trains. Regulators, especially precision regulators, are complicated basic components of pneumatic industry. They are difficult to develop. Rare articles focusing on precision regulators were found. This thesis is part of the development efforts of the company. The thesis studies the same and the differences between normal and precision regulator first, then studies the structure and working principle of precision regulators in details. The math models of precision regulator’s static characteristics, dynamic characteristics were created, an AMESim model of the regulator was also created. From the items in the math models and the simulation results from the AMESim model, the characteristics of regulator were found not only affected by structure parameters such as diameter of bleeding hole, volume of pilot chamber, volume of outlet chamber, mass of main valve, total spring rate, but also the working conditions such as the outlet pressure setting and flow demanding.Key points of structure parameters can be identified from the math model of static characteristics. From the math model of dynamic characteristics, structure parameters and working parameters affecting the characteristics of regulator can be figured out.The AMESim model was used to analyze how the characteristics were affected by structure and working parameters. Diameter of bleeding hole and the adjustable orifice added in outlet port was focused on. Working conditions simulated includes: minimum outlet pressure response to inlet step, various outlet pressures response to inlet step, outlet pressure responses to flow step, characteristics of forward flow, regulation and relief. |
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